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Patented Aug. 23, I898. J. H. CLARK.

ELEVATOR.

(Application filed my 26; 1887.]

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UNITED STATES PATENT OFFICE.

JOHN ll. CLARK, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE lVlIITTIER MACHINE COMPANY, OF SAME PLACE.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 609,533, dated August 23, 1898. Application filed May 26, 1887. Serial No. 28 9,438. (No modeh) T aZZ whom it may concern.-

Be it known that I, JOHN H. CLARK, of Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Elevators, of which the following description, in connection with the accompanying drawin gs, is a specification, like letters and figures on the drawings representing like parts.

This invention relates to that class of elevators in which the valve controlling the motive power is operated by electricity under control of the operator in the elevator-car, and is an improvement upon the elevator shown and described in United States Patent No. 353,123, granted to me November 23, 1886.

In this my present invention the main valve is operated bya piston reciprocated in a cylinder by water or other pressure admitted thereto, the admission of water or other pressure being controlled by an auxiliary balanced valve operated by electrical devices shown as magnets under control of the operator in the elevator-car, the said auxiliary balanced valve being centered, as shown, to stop the movement of the car by a spring upon the auxiliary-valve stem or rod.

Another feature of my invention consists in providing the piston connected to the main valve with one or more relief-valves,whereby the said piston may be moved irrespective of the auxiliary balanced valve, as will be described.

The particular features in which my invention consists will be pointed out in the claims at the end of this specification.

Figure 1,in sectional elevation, shows a sufficient portion of a building provided with an elevator operated in accordance with my invention to enable my invention to be understood; Fig. :2, a vertical section or" myimproved auxiliary balanced valve; Fig. 3, a section of Fig. 2 in the irregular line 00 m; Fig. 4, an enlarged section of the cylinder and piston therein connected to the main valve, and Fig. a modification to be referred to.

Referring to Fig. 1, A represents the hoist- Way,for1ned by the walls a of the building or other structure. vVithin the hoistway is located an elevator-car A, suspended by a rope (2, passed about a sheave a at the top of the building and. about sheaves a a in the basement of the building, the sheave a being movable in guides a and having its shaft connected to the rod a of the piston a", reciprocating in a cylinder (0 all substantially as in my patent referred to.

The cylinder a as herein shown, is provided with an inlet-passage a and an exhaustpassage a controlled, as shown, by a slidevalve a in a valve-chest a The slide-valve a is provided, as herein shown, with valve-rods Z) and I), the valverod 6 being connected to a piston b reciprocating in a cylinder 5 supported, as shown, by the cylinder a and a bracket b fastened to the said cylinder.

The cylinder 6 is provided, as shown, at its opposite ends with ports Z1 b connected by pipes b b with passages Z1 Z2 in a block 0, constituting part of an auxiliary-valve chest 0, the said block having port-openings c c 0 the port-opening c communicating with the Water-inlet 0 the port 0 communicating with the passage D and the port 0 with the passage If.

The auxiliary-valve chest 0 contains within it a balanced slide-valve 0 provided with ports 0' 0 connected by the passage 0 (see Fig. 2) and the port 0 communicating with the valve-chest c.

The valve 0 at its upper side is cut away or countersunk, as shown, to form between the cover c of the valve-chest and the top of the valve a chamber 0 connected by the passage 0' with the passage 0 so that water or other pressure may be admitted into the chamber 0' to balance the valve 0.

The auxiliary valve 0 has connected to it a valve-stem cl, extended through the side of the auxiliary-valve chest and through a stuffing-box d, as herein shown, the said stuflingbox being held in place by a cap d screwed upon a threaded projection 67, on the valvechest.

The auxiliary-valve rod (Z, as herein shown, has connected to it a plate 6?, forming an armature for magnets d d on opposite sides of the said plate, the magnet (Z being connected in circuit with a battery B and the magnet d with a battery B, the terminals of the batteries B B being shown as push-buttons (1 d located in the car A, the button d being connected with the battery B by wires 2 3, while the button 61 is connected with the battery B by wires 4 5.

The car A, as shown in Fig. 1, is supposed to have been stopped at the first floor, (marked D.) Let it be supposed that the push-button d has been closed to magnetize the magnet d", thus drawing the armature (1 toward it and moving the auxiliary valve into the position shown in Fig. 2, wherein the water-inlet c is connected with the port 0 communicating with the passage b to admit pressure into the cylinder 19 at the right of the piston b the said pressure flowing through the said valve, the passage b and pipe 19 The water or other pressure, entering the cylinder 19 through the port b forces the piston toward the left or in the direction of arrow 20, thus moving the valved so as to connect the passage 0. with the exhaust a of the cylinder a and permit the car to descend by gravity. Immediately after the car begins to descend the circuit of the battery B is broken at the push-button d The spring c then assumes control and moves the armature to a central position between the magnets, thus centering the auxiliary balanced valve. If it is desired to ascend, the operator presses the button 61 to close the circuit of the battery B, thus magnetizing the magnet d which attracts the armature d and moves it, together with the auxiliary valve, toward the right or in the direction of arrow 2, the passage c in the valve being connected with the port a in the valve-block and the port 0 with the port 0 WVith the valve in the position just mentioned pressure enters the inlet 0 and passes through the passages c c 0 through the port a, passage 1)", and pipe 19 connected therewith, into the cylinder 11 through the port 1), moving the piston b and valve a to ward the right, so as to uncover the passage 61.9 and admit pressure into the cylinder a to move the piston a toward the right or in the direction of arrow 23, thus raising the elevator-car.

If it is desired to stop the car on its ascent, the circuit of the battery B will be closed, so as to move the armature d and the auxiliary valve toward the left to admit pressure into the cylinder 19 through the port I) to move the piston 19 toward the left, as above described. When the piston 12 has reached its central position, the valve 0, is centered and the car stopped, and when the car has stopped the circuit of the battery B is opened, so that the said piston b and valve a remain centered. If it is desired to stop the car on its descent, the circuit of the battery B will be closed in like manner until the car has stopped, when it will be opened. When the auxiliary valve is centered, the ports 0 c are covered, thus cutting off all communication between the pressure-inlet c and the cylinder b the piston 12 being then in its central position (shown in Figs. 1 and 4) with an equal pressure on each side.

To enable the main valve a to be moved by the operator in the car A through the shipper-rope, such as commonly employed in elevators, I make use of one or more pressurerelieving devices (shown as relief-valves) located, preferably, in the piston 12 The reliefvalves referred to are shown in the present instances as plungers e, fitting into openings extended through the said piston. Each plunger is provided with a rod 6 extended from both sides of the said plunger and supported near its opposite ends, as herein shown, by caps 6 preferably screwed into the said piston, the said rod on each side of the plunger having, as herein shown, a spring a to center the plunger, as will be described, the said caps, as shown, having openings 6 The valve-rod b of the main valve is con nected to a lever f, pivoted, as shown, at f to the cylinder a the said lever having at its upper end an eye or fork to embrace a rope f passed about a sheave f located near the cylinder at", and about a sheave f, located, as shown, in the elevator-well or hoistway, the latter sheave also having passed about it the shipper-rope f extended through the car and passed about a sheave f supported at the top of the building. As shown in the drawin gs,the operator moves the shipper-rope in the direction of arrow 27 if it is desired to have the elevator-car descend, the lever f being turned toward the left, as herein shown, by a dog on the rope f thus moving the valve 00 so as to connect the passage a with the exhaust a. When the shipper-rope is moved by the operator to cause the car to descend, as described, the water within the cylinder b on the left of the piston 19 which would normally prevent the movement of the said piston in that direction, acts upon the plungers e and moves them out of the openings into their dotted-line position, Fig. 4, thus forming a relief for the pressure on the left of the piston, the water flowing through the said openings to the right of the piston.

I do not desire to limit myself to the exact means shown for relieving the pressure within the cylinder 19 as the said pressure may be relieved by equivalent and well-known con struction. 1

It will be noticed that the auxiliary Valve is surrounded by the exhaust only, which escapes through the valve chest to the port or opening f Referring to Fig. 5, I have shown a modi fied form of the auxiliary balanced valve, it consisting of a block g, provided with passages g 9*, extended through the block and constituting inlet-ports for the said valve, and with a chamber or recess 9 formed at the under side of the said block, constituting the passage by which the exhaust 9 may be brought into communication with the passages g connected with the piston b.

I claim--- 1. In an elevator, the combination of the following instrumentalities, viz: an elevator car, a cylinder containing a piston connected with and to operate said car, a main valve to control the flow of fluid to and from said cylinder, an auxiliary cylinder containing a piston connected with and to move said main valve, an auxiliary valve for said auxiliary cylinder, electromechanical devices controllable from the car to move said auxiliary valve and thereby the main valve, independent mechanical devices also controllable from the car to move said-main valve, and reliefvalves for and to permit circulation of the fluid from one to the other end of said auxiliary cylinder when the piston therein and its connected main valve are moved by said mechanical devices, substantially as described.

2. In an elevator, the combination of the following instrumentalities, viz: an elevatorcar, a cylinder containing a piston connected with and to operate'said car, a main valve to control the flow of fluid to and from said cylinder, an auxiliary cylinder containing a piston connected with and to move said main valve, an auxiliary valve for said auxiliary cylinder electromechanical devices controllable from the car to move said auxiliary valve and thereby the main valve, independent mechanical devices also controllable from the car to move said main valve, and reliefvalves in the piston of the auxiliary cylinder to permit circulation of fluidfrom one to the other side of the piston in the cylinder when the piston and its connect-ed valve are moved by the said mechanical devices, substantially as described.

3. In an elevator the combination of the following instrumentalitics, viz: an elevatorcar, a cylinder containing a piston connected with and to operate said car, a main valve to control the flow of fluid to and from the said cylinder, an auxiliary cylinder containing a piston connected with and to move the main valve, electromechanical devices controllable from the elevator-car, whereby the piston in the auxiliary cylinder is moved and thereby the main valve, independent mechanical devices also controllable from the elevator-car and connected to move the main valve, and relief-valves for, and to permit the circulation of fluid from one to the other side of the piston in the auxiliary cylinder, substantially asand for the purposes set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

JOHN II. CLARK.

IVitnesses:

J AS. H. CHURCHILL, F. L. EMERY. 

